On April 15, 2016, a post was made on Christian Distefano's Twitter & Facebook page confirming that the voices for the first Season 4 episode had been recorded. An official announcement by Nickelodeon was made on June 21, 2016.
Here is a list of writers for Season 4 and how many episodes they wrote. This list is in most-to-least order.
Each listing will contain the episode number, name, original U.S. airdate, and its writer.
Season 4 Trivia